Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第16卷    第6期    总第87期    2006年6月

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文章编号:1004-0609(2006)06-1070-06
LiF-NaF-KF-K2TiF6-KBF4熔体中
电沉积TiB2的阴极过程
李 军1, 李冰2

(1. 上海工程技术大学 材料工程学院, 上海 201600;
2. 华东理工大学 资源与环境工程学院, 上海 200237
)

摘 要:  采用循环伏安法研究了700 ℃时46.5LiF-11.5NaF-42KF(摩尔分数, %)熔盐中Ti(Ⅳ)(c(K2TiF6)=0.2 mol/L)和B(Ⅲ)(c(KBF4)=0.4 mol/L)在铂电极上的电化学还原机理, 计算了各还原步骤传递的电子数。 研究了LiF-NaF-KF-K2TiF6-KBF4c(K2TiF4)=0.3 mol/L, c(KBF4)=0.3, 0.6, 0.9 mol/L)熔盐中电化学合成TiB2的阴极过程机理。 结果表明: Ti(Ⅳ)的电化学还原为三步电荷传递反应, 且阴极过程近似可逆; B(Ⅲ)在铂电极上的电化学反应机理为简单的三电子一步反应, 阴极过程近似可逆; Ti(Ⅳ)和B(Ⅲ)可在同一电位下发生共沉积并反应生成TiB2

 

关键字:  二硼化钛; 电化学还原; 熔盐

Cathode process of titanium diboride electrodeposition in LiF-NaF-KF-K2TiF6-
KBF4 molten salt
LI Jun1, LI Bing2

1. School of Materials Engineering,
Shanghai University of Engineering Science, Shanghai 201600, China;
2. School of Resource and Environment Engineering,
East China University of Science and Technology, Shanghai 200237, China

Abstract: The mechanism of the electrochemical reduction of  Ti(Ⅳ) (c(K2TiF6)=0.2 mol/L) and B(Ⅲ) (c(KBF4)=0.4 mol/L) on the platinum electrode in 46.5LiF-11.5NaF-42KF (mole fraction, %) molten salt at 700 ℃ were investigated by means of the cyclic voltammetry technique. The cathode process of titanium diboride (TiB2) formation was also studied on the platinum electrode in the 46.5LiF-11.5NaF-42KF-K2TiF6-KBF4 (c(K2TiF4)=0.3 mol/L, c(KBF4)=0.3, 0.6, 0.9 mol/L)molten salt at 700 ℃. It is found that the electrochemical reduction of Ti(Ⅳ) proceeds in three-step charge transfer, the cathodic process is quasi-reversible. The electrochemical reduction of B(Ⅲ) occurs in one-step charge transfer, the cathodic process is quasi-reversible. The electrolytic codeposition of Ti(Ⅳ) and B(Ⅲ) with the formation of TiB2 can be achieved.

 

Key words: titanium diboride; electrochemical reduction; molten salt

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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